Cutting tool



'W. H. McKENZIE.

CUTTING TOOL. APPLICATION FILED JUNE 10, 1920. 1 409 96Q Patented Mar. 21, 1922.

Formed UNITED STATES WILLIAM H. MCKENZIE, OF OAKLAND, CALIFORNIA.

CUTTING TOOL.

Specification of Letters Patent Patented Mar. 21, 1922.

Application filed June 10, 1920. Serial No. 387,897.

tain new and useful Improvements in Cut ting Tools, of which the following is a specification.

This invention relates to an improved cutting tool and has as one of its principal objects to provide a device of this character wherein the tool will be so formed that a tool body of one grade of material may be employed while the tool bit only will be formed of a hardened high grade material, thus effecting a pronounced saving in production cost.

The invention has as a further object to provide a tool which, while employing different grades of material for the tool body and bit respectively, will, nevertheless, operate with an efficiency equal to any ordinary cutting tool.

And the invention has as a still further object to provide a tool wherein the tool bit will be firmly and securely mounted upon the tool body so that chattering or displacement of the bit will not occur.

Other and incidental objects will appear hereinafter.

in the drawings:

Figure l is a fragmentary perspective view of my improved cutting tool,

Figure 2 is a transverse section taken on theline 22 of Figure 1, and looking in the direction of the arrows,

Figure is a fragmentary perspective showing the head of the tool body and the mounting of the bit thereon, the head of the tool bodybeing partly broken away and shown in section, and

Figure 4 is an elevation showing a slight modification of the invention.

In carrying the invention into effect, I employ a tool body having a head 10 from which extends a somewhat reduced shank 11. At its outer end the head is formed with a rounded nose 12 while the upper side of the head at its outer end portion is cut away to provide a flat face 13 sloping rearwardly from the outer end of the nose and inclining sharply toward one side of the head.

nally extending slot 14 opening through the upper side of the head and through the outer end thereof. As particularly brought medially of the head is a longitudi-' out in Figure 2, this slot is substantially directed socket 15 opening through the flat inner end Wall of the slot.

Pressed into the slot 14: of the tool body is a bit 16. This bit is dove-tail in cross section to snugly fit within the slot and, at its upper side, lies flush with the upper side face of the head 10. At its rear end the bit is formed with a fiat wall to abut the flat inner end wall of the .slot and extending rearwardly from the inner end of the bit is a locking stud 17 therefor having binding engagement within the socket 15 of the head. As will thus be perceived, the sloping walls of the bit will coact with the sloping walls of the slot 14 to prevent any chattering of the bit upon the head of the tool body while the locking stud 17 will serve to firmly secure the bit against forward displacement. At its outer end portion, the upper side of the bit is cut away to provide a fiat face lying flush with the fiat face 13 of the head and the outer end of the bit is rounded to lie flush with the rounded face of the nose 12.

Attention is now directed to the fact that by constructing the tool as just described, it is possible, without sacrificing any beneficial results, to form the tool body from a relatively cheap grade of material and employ a high grade material only in the bit.

The tool body ispreferably formed of cold rolled steel while what is generally known 1 as high speed tool steel is employed in forming the hit. As is wellknown, highspeed tool steel is quite expensive and, as will thus be at once appreciated, I provide a tool wherein a material saving is effected in production cost. Heretofore, it has been found ditficult to properly secure a hardened bit upon a tool body of softer material since the hard metal of the bit would, in the practical use'of such a tool, soon stretch the tool body sufficiently to cause looseness of the bit.

However, in the present instance, I have overcome these disadvantageous features by the provision of the locking stud 17 upon the bit, this stud serving'not only to counteract longitudinal canting of the bit'but also acting to hold the b't against longitudinal outward displacemen In Figure 4 of the drawings, I have illustrated a slight modification of the invention wherein a tool body is employed having a.

' struction and carries a bit 20 like the bit shank 18 at the forward of which is a laterally directed head 19. This head is identical with the head 10 01? the preferred con- 16. The distinguishin feature of the modified structure lies in t e fact that the bad of the'toolbody' is directed laterally to provide a right hand tool. a As will be seen, a left hand tool could be readily formed by directing the head of the tool body laterally in the opposite direction. I accordingly reserve the right to all such minor variations of the invention as may fall within the spirit of the ap ended claims. v

Having thus escribed the invention, what is claimed as new is 1. A cutting tool including a body havin a head provided with a slot opening throu the upper side of the head and throu h t e outer end thereof, the slot being forme with converging walls, and a bit seated in said slot and engaged by said walls to be held.

thereby against upward movement within the slot, the bit being provided with looking. 1

means extending rearwardly therefrom and coacting with the head for securing the bit for. securing the bit against outward longi tudinal dis lacement.

3. A cuttlng tool including a bodyhaving a head provided with a slot, there being a rearwardly directed socket extending from the inner end of said slot, and a bit seated in the slot and provided at its inner end with a rearwardly directed stud engaging in said socket and securing the bit against outward longitudinal displacement.

In testimon whereof I aflix 111g signature. WILLIA H. MoKENZ [n 8.]. 

